I have salt and pepper hair (50% grey hair). What type of color should I use? (faq050e)

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Question. I have salt and pepper hair (50% grey hair). What type of color should I use? Answer. Since gray hair can be more resistant to haircolor, you should use a hair color that contains ammonia. Ammonia helps open up the cuticle of the hair by causing the hair to swell up, and allows the color pigments to enter the hair shaft.